Question

calcule o valor numérico das expressões algébricas.​

Answer 1

a) 5a + 2b + c

5 . 2 + 2 . 1 + 7 = 10 + 2 + 7 = 19

b) 3x + a

3 . 5 + 2 = 15 + 2 = 17

c) 2x - 5y

2 . 2 - 5 . (-3) = 4 - (-15) = 4 + 15 = 19

d) x . y + 5

----------- =

x

3 . 4 + 5

------------ =

3

12 + 5

-------- =

3

17

---

3

e) mn + a

---------- =

mn - a

3 . 2 + 5

------------ =

3 . 2 - 5

6 + 5

------- =

6 - 5

11

--- =

1

11